Application of the order spectrum method based on the generalized demodulation time-frequency analysis and the instantaneous frequency calculation to the gear fault diagnosis
Cheng Jun-sheng; Li Bao-qing; Yang Yu
State key Laboratory of Advanced Design and Manufacture for Vehicle Body, Hunan University, Changsha, 410082
Abstract：Targeting the frequency demodulation characteristics of the gear fault vibration signal in the tart-stop process, the order spectrum method based on the generalized demodulation time-frequency analysis and the instantaneous frequency calculation is proposed and applied to the processing of the gear transient signal in this paper. The generalized demodulation time-frequency analysis approach which is a new signal processing method can decompose a multi-component signal into some single-component signals whose instantaneous frequency posse physics sense. Each single-component signal can be amplitude and frequency modulated signal. Therefore, the generalized demodulation time-frequency analysis approach is very suitable to process the multi-component amplitude and frequency modulated signals. When fault occurs in gear, the gear vibration signal in the start-stop process shows the multi-component amplitude and frequency modulated characteristics. In the order spectrum method based on the generalized demodulation time-frequency analysis and the instantaneous frequency calculation, firstly the multi-component signal is decomposed into some single-component signals by using the generalized demodulation time-frequency analysis method; secondly the instantaneous frequency of each single-component signal is calculated; thirdly each instantaneous frequency is resampled in angle-domain; finally the spectrum analysis is applied to each resampled signal and the order spectrum can be obtained. Hence, the fault characteristics of the gear vibration signal can be obtained and the gear work state can be identified according to the order spectrum. The analysis results form the simulated and experimental signals show the effectiveness of the proposed method.
程军圣;李宝庆;杨宇. 基于广义解调时频分析和瞬时频率计算的阶次谱方法在齿轮故障诊断中的应用[J]. , 2011, 30(9): 30-34.
Cheng Jun-sheng;Li Bao-qing;Yang Yu. Application of the order spectrum method based on the generalized demodulation time-frequency analysis and the instantaneous frequency calculation to the gear fault diagnosis. , 2011, 30(9): 30-34.
2011, Vol. 30 
